Spring-cushion structure.



F. P. DARCY.

SPRING CUSHION STRUCTURE. APPL non FILED OCT 19 19 11 ,25% 3 1 Q Patented Jan. 22, 1918.

FBANK P. D AIRGY, 0F KALAIVIAZOO, MICHIGAN.

SPRING-CUSHION STRUCTURE.

Specification of Letters Patent.

Patented Jan. 22, 19118.

Application filed October 19, 1814. Serial No. 867,490.

To all whom 2'15 may concern:

Be it known that I, FRANK P. DAncY, a citizen of the United States, residing at Kalamazoo, Michigan, have invented certain new and useful Improvements in SpringCushion Structures, of which the following is a specification.

This invention relates to improvements in spring cushion structures.

The main objects of this invention are:

First, to provide an improved spring structure having two sets of springs, one of which is longer than the other so that when the longer set is partially compressed the shorter set or auxiliary set is brought into action.

Second, to provide an improved spring cushion structure having these advantages in which the springs are mounted on supporting bars so that they can be readily at tached to the cushion frame and are supported so that the coils of the sets of springs do not come into contact as the springs are collapsed and so that the springs are held in upright position under various conditions.

Further objects, and objects relating to structural details, will definitely appear from the detailed description to follow.

I accomplish the objects of my invention by the devices and means described in the following specification. The invention is clearly defined and pointed out in the claims.

A structure which is a preferred embodiment of my invention is clearly illustrated in the accompanving drawing forming a part of this specification, in which:

Figure I is a perspective view of a single spring supporting bar having springs mounted thereon, a portion of the bar being broken away to show the arrangement of the bottom coils of the spring.

Fig. II is a detail transverse vertical section on a line corresponding to line 2-2 of Fig. I.

Fig. III is a detail transverse section of a slightly modified structure.

In the drawing similar reference characters refer to similar parts throughout the several views, and the sectional views are taken looking in the direction of the little arrows at the ends of the section lines.

Referring to the drawing, I provide a set of main spiral springs 1 and a set of auxiliary spiral springs 2, the springs being arranged in pairs one within the other. The main springs 1 are longer than the auxiliary springs 2 while the auxiliary springs 2 are of greater diameter than the main springs 1 so that the coils of the main springs arranged in the auxiliary do not come into contact with the coils of the auxiliary springs as the springs are collapsed. The bottom coils 3 and l of the auxiliary and main springs are arranged one within the other, as shown in the drawings, and are bent upwardly at the center to embrace the apex of the A-shaped sheet metal supporting bar 5. This supporting bar is provided with inturned flanges 6 at each edge, the flanges being folded upon the bottom coils of the springs 7 and indented between the coils at 7-7, so that the bottom coils of both sets of springs are rigidly secured to the supporting bar, that is, they are secured against lateral or turning movement thereon and against shifting relative to each other.

The top coils S of the auxiliary springs are connected to the adjacent coils of the main springs by means of links 9. These links have oblong eyes 10 which loosely embrace the coils so as to allow some movement of the coils in the eyes as the springs collapse, thus allowing independent movement of the coils relative to each other, the links however prevent the tilting of either the in nor or the outer springs under unusual stresses so that it is quite impossible for the coils to become interlocked or to come into engagement which would render the structure noisy.

In the modified structure shown in Fig. III the links are provided with eyes 11 folded tightly around the coils.

My improvements are especially well adapted for use in automobile cushion seats as they adapt the same for persons of different weight and also provide the lighter resilient springs for carrying the weight under ordinary conditions and the auxiliary springs to receive the extra strains on rough roads and the like. The auxiliary springs connected to the central coils of the main springs also serve to brace the taller main springs against objection-a1 swaying or tilting movement without materially detracting from the resiliency thereof.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a spring structure, the combination of a sheet metal supporting bar ft-shaped. in

cross section and having inturned flanges at its edges, and helically coiled springs arranged in nested pairs with the bottom coils of the inner Within the bottom coils of the outer, said bottom coils being saddle shaped and arranged to engage the apex of said supporting bar, the flanges of said supporting bar being clamped upon the bottom coils and inset between them.

2. In a spring structure, the combination of a supporting bar having inturned flanges at its edges, and helically coiled springs arranged in nested pairs with the bottom coil of the inner Within the bottom coil of the outer and independently resting on said supporting bar, the flanges of said supporting bar being clamped upon the bottom coils of both springs and inset between them.

3. In a spring structure, the combination of a supporting bar having inturned flanges at its edges, and helically coiled springs arranged in nested pairs with the bottom coil of the inner Within the bottom coil of the outer and independently resting on said supporting bar, the flanges of said supporting bar being clamped upon the bottom coils of both springs and supporting them rigidly in spaced relation.

In Witness whereof, I have hereunto set my hand and seal in the presence of two Witnesses.

F RANK P. 'DARCY. Witnesses:

LUELLA G. GREENFIELDQ MARGARET L. GLASGOW.

(2091:: or this patent may be obtained or five cents each, by addressing the "Commissioner of ratents,

Washington, D. C. 1

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